I have started refusing to answer calls from those to rude or sneaky to identify themselves. This caller was, "Not Available". No message was left.....
This dude from 703-372-0787 just called at 8:50pm! Wtf...he asked for the lady or man of the house. I simply said I'm sorry, can I take a message. He said no message, I'll call back later and hung up. Uh...no thank you!
I let my answering machine answer. Ir simply says, "No one is available to take your call, please leave a message." They don't.
Caller ID says Springfield VA. Seems like a scammer of some sort.
I will block them if they become a bother. Some Panasonic phones allow you to block up to 250. Fios allows you to either block all "Private" calls or up to 100 numbers.
Ever try letting unknown numbers ring with NO kind of an answer? Be patient and ignore the phone entirely. You can get them tired of wasting time calling you after a bit.